Fix TenderSearch button interaction, guard duplicate submits, and add portal link in results

frontend/app/page.tsx

@@ -116,7 +116,7 @@ export default function HomePage() {
     window.history.pushState({}, '', `?tab=tender_search&q=${encodeURIComponent(value)}`);
   };
 
-  const handleSearch = async (params: { keyword?: string; buyer?: string; provider_code?: string; date?: string; skip?: number; limit?: number; isAgile?: boolean }) => {
+  const handleSearch = async (params: { keyword?: string; buyer?: string; provider_code?: string; org_code?: string; status?: string; code?: string; date?: string; skip?: number; limit?: number; isAgile?: boolean }) => {
     try {
       let results: Tender[];
       if (params.isAgile && params.keyword) {

frontend/components/TenderSearch.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { Fragment, useMemo, useState, useEffect } from "react";
+import { Fragment, useMemo, useState, useRef, useEffect } from "react";
 import BrandLoader from "./BrandLoader";
 import type { Tender } from "../lib/types";
 import { Language, translations } from "../lib/translations";
@@ -39,6 +39,7 @@ export default function TenderSearch({ tenders, onSearch, onAnalyze, forceShowFo
   const [showOnlyFollowed, setShowOnlyFollowed] = useState(forceShowFollowed);
   const [isLoading, setIsLoading] = useState(false);
   const [isAgileMode, setIsAgileMode] = useState(false);
+  const isSearchPending = useRef(false);
   const itemsPerPage = 50;
 
   const isTenderCode = /^[0-9]+-[0-9]+-[A-Z0-9]+$/i.test(keyword);
@@ -101,6 +102,8 @@ export default function TenderSearch({ tenders, onSearch, onAnalyze, forceShowFo
 
   const handleSearch = async (e?: React.FormEvent) => {
     if (e) e.preventDefault();
+    if (isSearchPending.current) return;
+    isSearchPending.current = true;
     setIsLoading(true);
     try {
       // Logic: If the query looks like a code (contains hyphens), prioritize code search
@@ -122,6 +125,7 @@ export default function TenderSearch({ tenders, onSearch, onAnalyze, forceShowFo
       console.error(error);
     } finally {
       setIsLoading(false);
+      isSearchPending.current = false;
     }
   };
 
@@ -380,6 +384,16 @@ export default function TenderSearch({ tenders, onSearch, onAnalyze, forceShowFo
                                 {followedCodes.includes(tender.code) ? "★" : "☆"}
                               </button>
                               <span className="font-mono text-purple-400 text-[9px] truncate">{tender.code}</span>
+                              <a
+                                href={`https://www.mercadopublico.cl/fichaLicitacion.html?code=${tender.code}`}
+                                target="_blank"
+                                rel="noopener noreferrer"
+                                onClick={(e) => e.stopPropagation()}
+                                className="ml-2 text-[10px] text-slate-400 hover:text-white transition"
+                                title="Open Tender in Mercado Público"
+                              >
+                                ↗
+                              </a>
                             </div>
                           </td>
                           <td className="px-4 py-5">